A number of recent studies have found correlations between academic dishonesty in higher education and unethical behavior in work settings. However, these studies have not explored the causal relationship between the underlying factors that lead to this dishonesty. This realization, and apparently high levels of cheating among engineering students, has lead us to a research hypothesis that decisio...
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This article presents a critical analysis of the classical definitions of the radiation regions for the particular case of short, λ/2, or λ dipole antennas, regions which we have revisited. We worked out a definition of radiation zones from consistent criteria directly linked with radiation characteristics: radiated field, wavefront, wave impedance, and radiated power. The "far-field...
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This work proposes a method for feeding a balanced IRA with an unbalanced transmission line. This method is based on the current distribution on the surface of the antenna. The method of moments (MoM) simulations show that for the IRAs, there are some areas with low current density in comparison to the current density of the feeding points, almost over the entire frequency range. The coaxial cable...
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Recent years have seen a spectacular increase in our capability to model, simulate the performance of, and design complex electromagnetic systems. Much progress has been made in enhancing the available numerical techniques, viz., the method of moments (MoM), the finite-element method (FEM), and the finite-difference time-domain (FDTD) or its variants. Great strides have recently been made in enlar...
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The advantages of antennas that can resemble the shape of the body to which they are attached are obvious. However, electromagnetic modeling of such unusually shaped antennas can be difficult. In this paper, the commercially available software SolidWorks™ is used for accurately drawing complex shapes in conjunction with the electromagnetic software FEKO™ to model the EM behavior of con...
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Users of ionospheric data from the digisonde network assembled at the University of Massachusetts Lowell to learn about the latest available tools for the processing and analysis of different data collected by the network of digisondes. These modern ionosondes derive vertical electron-density profiles in real time. Recent improvements in the automatic ionogram scaling algorithm ARTIST have signifi...
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The appearance of a layer of charge or current on the boundary of a material usually implies that a discontinuity in an electromagnetic field occurs at that boundary. The converse is not necessarily true. The reaction of the electromagnetic field to the charge or current layer is a stress communicated across the boundary. Determination of the charge or current on a boundary must take all the stres...
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We investigate the mutual power-spectra distributions in the azimuth, elevation, and time-delay domains in different urban environments with randomly distributed arrays of buildings placed on rough terrain. This is done for various orientations of street guiding structures in the urban scene, and for different elevations of the terminal antenna, the base station, and the subscriber, whether mobile...
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A partial eigenfunction expansion of the electric-type dyadic Green's function used in aperture-coupled waveguide problems is discussed in connection with the traditional Green's function expansion in terms of the waveguide modes. Based on the principles of distributions, the delta-function term is extracted from a double series, resulting in the complete representation of the Green's function in ...
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Various numerical techniques have been developed for modeling electromagnetic field propagation in various novel complex media. The validity of these techniques is usually verified by comparison to the exact solutions of canonical problems. Recently, research has focused on chiral media, a subclass of materials known as bianisotropic materials, and numerical techniques have been developed in order...
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The formulation of the boundary conditions for electromagnetic problems is reexamined. It is shown that specifying a pair of two collinear field components on the boundary surface, one electric and one magnetic, ensures uniqueness, regardless of whether the pair is tangential or normal to the surface. Such boundary conditions, although not commonly used, are a possibility that the author may want ...
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